<tr class="tr_<?php echo$this->id?>" >
    <td><?php echo $this->escape($this->id);?></td> 
    <td><?php echo $this->escape($this->usuario);?></td> 
    <td><?php echo $this->escape($this->nombre);?></td> 
    <td>
    <?php echo implode('<br>',$this->grupos)?>
    </td> 
    <td><?php echo $this->escape($this->mail);?></td> 
    <td><?php echo $this->escape($this->tlf);?></td> 
    <td><?php echo $this->escape($this->estado);?></td> 
    <td>
    	<div class="botones">
    		<?=$this->editarFila('usuario',$this->id);?>
    		<?=$this->borrarFila('usuario',$this->id);?>
  		</div>
    </td>
</tr>